Magneto-optical memory element

Details Magneto-optical memory element Magneto-optical memory element

G - Physics

11

B

352/33.3

G11B 11/10 (2006.01) G11B 11/105 (2006.01) G11B 13/04 (2006.01)

Patent

CA 1326548

ABSTRACT A magneto-optical memory element for reading, writing or erasing information by means of a laser beam has a multi- layer construction comprising in sequence from the side on which light is incidence a first transparent dielectric film, a rare earth transition metal alloy film, a second transparent dielectric film and a reflective film. The invention employs the circular dichroism effect of a magnetic material for reading information. To this end, the rare earth transition metal alloy film has a refractive index represented by n ? .DELTA.n wherein n = 3.2 - 3.55i and .DELTA.n = 0.05 - 0.03i and a thickness of 18 to 46 nm, and the second transparent dielectric film has a refractive index of 2.0 ? 0.2 and a thickness of 80 to 108 nm. The improved perform- ance achieved in this way enables information to be read without the analyzer that has previously been necessary, thus simplifying the equivalent.

608036

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